In other words, it's going to be more slippery than ever. Brushed metal is slippery because it has less grip. Smooth and rounded edges are more slippery because it has less grip.
It will probably have a matte glass back, which is also more slippery because it has less grip.
I wonder if the master of corporate greed, Tim Cook, does this intentionally in order to sell more Apple cases? Whether you buy an Apple case or go without a case, Cook wins either way. If you buy an Apple case, Cook makes money. If go without a case, you're much more likely to drop your phone and damage it, and then Cook makes money if you take it to an Apple Store for repair.